[INFO] fetching crate arduino_mkrzero 0.10.0...
[INFO] testing arduino_mkrzero-0.10.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate arduino_mkrzero 0.10.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate arduino_mkrzero 0.10.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-8/source/.cargo/config
[INFO] started tweaking crates.io crate arduino_mkrzero 0.10.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate arduino_mkrzero 0.10.0
[INFO] tweaked toml for crates.io crate arduino_mkrzero 0.10.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate crates.io crate arduino_mkrzero 0.10.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f8376bedcd8fe485d563add59c11f2e210413c5acd90039ea6857e0830cbefa7
[INFO] running `Command { std: "docker" "start" "-a" "f8376bedcd8fe485d563add59c11f2e210413c5acd90039ea6857e0830cbefa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f8376bedcd8fe485d563add59c11f2e210413c5acd90039ea6857e0830cbefa7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8376bedcd8fe485d563add59c11f2e210413c5acd90039ea6857e0830cbefa7", kill_on_drop: false }`
[INFO] [stdout] f8376bedcd8fe485d563add59c11f2e210413c5acd90039ea6857e0830cbefa7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1a309ff2acc588ea01f5f726dcdf9d328ba27f24c5586c52687e0eb299d19dc3
[INFO] running `Command { std: "docker" "start" "-a" "1a309ff2acc588ea01f5f726dcdf9d328ba27f24c5586c52687e0eb299d19dc3", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.12.0
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling syn v1.0.56
[INFO] [stderr]    Compiling cortex-m v0.6.4
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling vcell v0.1.2
[INFO] [stderr]    Compiling cortex-m-rt v0.6.13
[INFO] [stderr]    Compiling r0 v0.2.2
[INFO] [stderr]    Compiling bitfield v0.13.2
[INFO] [stderr]    Compiling atsamd21g v0.9.0
[INFO] [stderr]    Compiling usb-device v0.2.7
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling paste v1.0.4
[INFO] [stderr]    Compiling arduino_mkrzero v0.10.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling panic-halt v0.2.0
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling nb v0.1.3
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stderr]    Compiling embedded-hal v0.2.4
[INFO] [stderr]    Compiling usbd-serial v0.1.1
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling generic-array v0.13.2
[INFO] [stderr]    Compiling as-slice v0.1.4
[INFO] [stderr]    Compiling aligned v0.3.4
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.1.8
[INFO] [stderr]    Compiling atsamd-hal v0.12.0
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.24s
[INFO] running `Command { std: "docker" "inspect" "1a309ff2acc588ea01f5f726dcdf9d328ba27f24c5586c52687e0eb299d19dc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a309ff2acc588ea01f5f726dcdf9d328ba27f24c5586c52687e0eb299d19dc3", kill_on_drop: false }`
[INFO] [stdout] 1a309ff2acc588ea01f5f726dcdf9d328ba27f24c5586c52687e0eb299d19dc3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2029a55eebe317b53f8ef39f7bf5870112603fde83ee708ce023872bb2cef814
[INFO] running `Command { std: "docker" "start" "-a" "2029a55eebe317b53f8ef39f7bf5870112603fde83ee708ce023872bb2cef814", kill_on_drop: false }`
[INFO] [stderr]    Compiling arduino_mkrzero v0.10.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: language item required, but not found: `eh_personality`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: language item required, but not found: `eh_personality`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: duplicate lang item in crate `std` (which `test` depends on): `panic_impl`.
[INFO] [stdout]   |
[INFO] [stdout]   = note: the lang item is first defined in crate `panic_halt` (which `arduino_mkrzero` depends on)
[INFO] [stdout]   = note: first definition in `panic_halt` loaded from /opt/rustwide/target/debug/deps/libpanic_halt-16cc050dcbbfc30a.rlib
[INFO] [stdout]   = note: second definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/1.55.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-008055cc7d873802.so, /opt/rustwide/rustup-home/toolchains/1.55.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-008055cc7d873802.rlib
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `arduino_mkrzero` due to 2 previous errors
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2029a55eebe317b53f8ef39f7bf5870112603fde83ee708ce023872bb2cef814", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2029a55eebe317b53f8ef39f7bf5870112603fde83ee708ce023872bb2cef814", kill_on_drop: false }`
[INFO] [stdout] 2029a55eebe317b53f8ef39f7bf5870112603fde83ee708ce023872bb2cef814